Harold martin



HQ MARTIN.

MANOMETER.

APPLICATION FILED Aua.23.1916.

LSQASQI,

Patented Nov. 4, 1919.

Tlll|| l l|||| lllllIl l' me MAivoivi-ETER.

To all whom t may concern:

Be it known that I, HAROLD MARTIN, a subject of His Majesty the King of England, and resident of 29 Barry road, Dulwich, in the county of London, Kingdom of England, have invented Vcertain new and useful. Improvements in Manometers, of which the following is a specication.

This invention, for which application was filed in France on August 16, 1916, resulting in French Patent 482,571, relates to improvements in manometers of the kind in which an iron float in one or both branches or legs of a U-column of mercury serves to control the position of a pivotally mounted magnet disposed outside the tube or tubes and which carries a pointer or indicator.

IIeretofore it has been the common practice to make one or both .of the branches of the U-tubes wholly or partly of glass, and it is the primary object of the present invention to provide a device in which the glass is entirely eliminated and in which one or more of the branches or legs of the U-tube is of composite form being formed partly of one metal and partly of another the lower portion being of iron or other metal inactive with mercury, and the upper portion in the vicinity of the magnet being of copper or other non-magnetic metal -as hereinafter described.

Another object of the present invention is the provision of a manometer of the above kind in which each armature is carried b its float through the intermediary of a ro A further object of the present invention is t-he provision of a manometer comprising a composite metal U-tube of iron and copper, mercury in the lower or iron portion of the said tube, an armature or its equivalent floating on or from the mercury in each branch of the U-tube, an external magnet or its equivalent pivoted between the upper nonmagnetic portions of the tubes so as to cooperate with the said armatures and follow the movements thereof, and a pointer or pen for indicating on a scale or recording on a chart the divisions of which are, directly proportional to the movements due to the difference in level of the ends of the columns of mercury.

The present invention is illustrated in, and hereinafter described with reference to the accompanying drawings, in which Figure 1 is a general outside front elevation of a manometer having connections Specification of Letters Patent.

p Patented Nov. d, 1919.

- Application led August. 23, 1916. ASerial No. 116,548.

thereon, particularly adaptedforuse in connection with steam generators.

Fig. 2 is an elevation corresponding to the preceding figure but showing the whole of tlie outside casing removed and the rightv half of the tube and mechanism in section; and Fig. 3 is a sectional side elevation of the said device.

As shown, and iii a inaiiometer according to this invention the tubes a a containing the mercurycolumn are of metal. In each tube a isv an iron armature b fio-ated on orl from the mercury; and an external magnet system conveniently consisting of a pair of permanent. magnet bars c coperates with one or both of said armatures Zi to follow the movements thereof. The lower part of the tubes a a with which the mercury makes contact is made of iron or other metal inactive with mercury. The upper part in the vicinity of the magnet is of copper or other non-magnetic metal. The tubes (l care secured to a base or wall plate l and have a cross connecting channel c or they may be otherwise suitably connected at their lower ends.

As shown, each of the armatures b is carried on a rod feXtending from the actual float g which latter may be of iron.

Preferably, an astatic pair of magnets c is used, pivoted at c between the two tubes a a with one magnet bar behind and one magnet bar in front of the sai-d tubes. The magnet system may have attached to it a pointer h for indicating on a scale z' or a pen for marking a recording chart. With a magnet c pivoted as described the graduations of the scale or chart are uniform.

In the arrangement shown each tube a is provided with a screw down valve j to facilitate the connecting up of the inanometer to high pressure steam lines and between the two connecting pipes 7c is also provided an equalizing stop valve Z for eiiabling the Zero of the instrument to be readily checked when in use.

It will be obvious that the magnet system could be reversed if desired by making the members b permanent magnets and the members c to serve as armatures.

What I claim is 1. A manoineter comprising a composite U-tube containing mercury and having oneand non-magnetic metal, a float and anV armature carried thereby in said tube, a

pivotally mounted magnet disposed loutsideV of said tube and coperating with said float and armature,and an indicator controlled by said magnet. y Y

2. A manometer comprising a composite U-tube having both of its legs .ormed partly of one metal and partly or' another, floats carrying armatures in said tubes, a pivot-- ally mounted magnet disposedoutside of said tubes and cooperating With said floats and armatures, and pointer or indicator Y Acontrolled by said magnet.

. an armature floating With the mercury inY 3. A manometer comprising a 'composite l metal U-tube of iron and copper, mercury inthe lower or iron portion of the said tube,

each branch'j of the U-tube, an external magnet or its equivalent pivoted loetvveen vtheY upper non-magnetic portions or" the tubes so as to cooperate with thegsaid armaV tures and follow lthe movements thereof,

Vand a pointer or pen for indicating on a scale the divisions of which are directly proportional to the movements due to thel difference in level of the ends of the columns of mercury substantially as described. Y

4. A manometer comprising a composite metal U-tube of iron and copper, mercury Copies of this patent may be obtained for inthe lower iron' portion of said tube, a lfloat in each or said tubes, an armature carried 'by each of'sai'd loats, an external magnet external to the said tubes and coperat-l ing VWith the floats and armatures, and a pointer or pencarried by said magnet.,v

5. .A manometer comprising a base, a

1U-tube having bothv of its legs formed of separable sections, one section of each leg being formed of ironandthe otherof vcopper, mercury in the iron portions' of said legs, an armaturefloating. with the mercury ineacli leg, an external magnet pivotallyv supported on *thev base so 4as to cooperateV with said armatures and follow the moverments'thereor", and a pointer controlled by said magnet. 1 l l ;6. Anianometer comprising Aa `composite Utube having both of itslegs formed partly of one'y metal and partly or' another, floats and armatures insaid legs,` a pivotally mountedinagnet 4disposed outside of said.

H. MARTIN.

ve cents each, by addressing the Commissioner of atents,

Washington, D.- G. 

